Tigris-Euphrates River System

There are three kinds of canals: controlled canals, receiving water from regulators on the main river in all seasons;
uncontrolled canals, taking water only when the river is in flood; and raised concrete flumes, usually requiring pumps. The principal canal systems are the following: a series of left-bank Euphrates canals between Al-Ramādī and Al-Musayyib, the most important being...